47607 ⎘
Methods or machines specially adapted for the production of tubular articles incorporating reinforcements or inserts prestressed reinforcements
Sub-classes:CORE WALL-THINNING DESIGN METHOD FOR PRESTRESSED HIGH-PERFORMANCE CONCRETE CYLINDER PIPE
#2Roadway conduit systems and methods
#3Conduit segment casting mold and method of forming a conduit segment
#4Method for forming an elongate support structure
#5Concrete pole and manufacturing method therefor